CMake: documented testing procedure

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110559 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CMake.html b/docs/CMake.html
index 40a2cec..a0473c9 100644
--- a/docs/CMake.html
+++ b/docs/CMake.html
@@ -313,9 +313,15 @@
 
 <div class="doc_text">
 
-<p>LLVM testing is not supported on Visual Studio.</p>
+<p>Testing is performed when the <i>check</i> target is built. For
+  instance, if you are using makefiles, execute this command while on
+  the top level of your build directory:</p>
 
-<p>TODO</p>
+<div class="doc_code">
+  <p><tt>make check</tt></p>
+</div>
+
+<p>Testing is not supported on Visual Studio.</p>
 
 </div>